Patent application number | Description | Published |
20090091182 | IMAGE FORMATION APPARATUS CAPABLE OF RECEIVING POWER FROM A PLURALITY OF POWER SOURCES AND CONTROL METHOD PERFORMED IN SUCH IMAGE FORMATION APPARATUS - A power supply unit selects one of drive power provided from an AC/DC conversion unit and that provided from a separation unit and outputs the selected drive power to a control unit and a transmission and reception unit continuously. If the AC/DC conversion unit and the separation unit both supply their respective drive powers, the drive power that has a higher voltage value, i.e., the first drive power, is selectively output. When the first drive power supplied is stopped, a diode transitions from the on state to the off state and a diode transitions from the off state to the on state. As a result the second drive power is selectively output. | 04-09-2009 |
20100284032 | IMAGE FORMING DEVICE HAVING OPERATING INFORMATION MANAGING FUNCTION - An image forming device includes a power source unit, motors supplied with and driven by electric power from the power source unit, and a control device for controlling the motors' operations. A CPU in the control device monitors presence/absence of power supply from the power source unit. When power is cut off during image forming, the CPU causes regenerative braking of the motors. The regenerated power is voltage-converted by a second DC-DC converter in the power source unit and supplied to the control device for continuously driving the CPU, which in turn backs up operating information. This eliminates inconsistency between the actual life status and the backed-up information when power is off, with no need of frequent backup during image forming. It is thus possible to provide the image forming device which can reliably manage operating information even if power supply to the motors is stopped during printing. | 11-11-2010 |
20100284673 | POWER SUPPLY CONTROL DEVICE FOR CONTROLLING POWER SUPPLY CONNECTED TO MOTOR - A power supply control device controls a power supply connected to a motor and includes: an AC/DC converter that makes a first DC power supply; a DC/DC converter that makes a second DC power supply out of the first DC power supply; a first rectifying element that allows current to flow from the first DC power supply toward the motor; a second rectifying element that allows current to flow from the first DC power supply toward the DC/DC converter; and a third rectifying element that allows current to flow from the motor toward the DC/DC converter. In this way, a power supply connected to a motor can be suitably controlled. | 11-11-2010 |
20120250357 | POWER SUPPLYING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A power supplying device provides power to the body of an image forming apparatus and an optional device connected to the body of the same. The power supplying device comprises: a rectifier circuit which rectifies an alternating current inputted from an alternating-current source; a booster circuit which boosts and smooths the direct-current voltage caused by the rectifier circuit; a judgment portion which judges whether or not there is an optional device connected to the body of the image forming apparatus; an identification portion which identifies the type of the optional device connected thereto; and a controller which, if there is an optional device connected thereto according to the judgment portion, adjusts the boosted voltage obtained by the booster circuit to a higher value than that if there is no optional device connected thereto, which depends on the type of the optional device identified by the identification portion. | 10-04-2012 |
20130183057 | IMAGE FORMING APPARATUS AND POWER CONTROL DEVICE - An image forming apparatus that forms a color image by overlaying toner images formed on respective first, second, and third photoreceptors, comprising: first, second, and third voltage-applied members respectively facing the first, second, and third photoreceptors; a first AC power supply generating first AC voltage, and superimposing the first AC voltage on first DC voltage to generate first voltage for causing a first electric field between the first voltage-applied member and the first photoreceptor; a second AC power supply generating second AC voltage, and superimposing the second AC voltage on second DC voltage to generate second voltage for causing a second electric field between the second voltage-applied member and the second photoreceptor; and a composite circuit superimposing a composite of the first voltage and the second voltage on third DC voltage, to generate third voltage for causing a third electric field between the third voltage-applied member and the third photoreceptor. | 07-18-2013 |
20130235622 | POWER SUPPLY DEVICE - A power supply device comprises: a rectifier circuit converting AC input voltage to DC; a smoothing capacitor connected to an output terminal of the rectifier circuit; a switching element turning on and off output from the smoothing capacitor to provide to a load; a switching controller controlling the switching of the switching element; a first signal input part generating a first signal for stopping the switching and keeping it stopped and inputting the first signal to the switching controller via a particular terminal thereof, when a trouble occurs on the power supply device; a detector detecting that the AC input voltage is a predetermined value or less; and a second signal input part generating a second signal for stopping the switching and keeping it stopped and inputting the second signal to the switching controller via the particular terminal, when the AC input voltage is the predetermined value or less. | 09-12-2013 |
20150177681 | APPARATUS ATTACHING A DETACHABLE UNIT - The apparatus includes first and second terminals, an electrical conductor placed around at least the second terminal, a first current applying unit, an abnormal circumstances determining unit, a second current applying unit, and an informing unit. The first current applying unit applies current between the first terminal and the second terminal. The abnormal circumstances determining unit determines whether there is an abnormal circumstance at the connection between the apparatus and the unit side circuit, under the condition that the current is applied by the first current applying unit. The second current applying unit applies current between the first terminal and the second terminal, in case that the abnormal circumstances determining unit determined that there is not an abnormal circumstance of the connection. The informing unit informs the abnormal circumstance of the connection, in case that the abnormal circumstances determining unit determined that there is the abnormal circumstance of the connection. | 06-25-2015 |
20150229231 | ELECTRIC POWER SUPPLY DEVICE WHICH CAN REDUCE THE AMOUNT OF POWER CONSUMPTION - Image forming apparatus comprises an electric power supply circuit board, an electric power control unit, functional circuits, and an electrical power saving circuit. The electric power control unit executes constant voltage control, to make electrical potential of a remote sensing location constant. The functional circuits are connected with the electric power supply circuit board. The electrical power saving circuit switches the state of functional circuits between the state in which they are provided with electric power and the state in which they are not provided with electric power. The electrical power saving circuit sets the contact point of the input side of the circuit, in which the consumption electrical current or the behavior guarantee minimum electrical voltage is the largest, out of the electrical power saving circuit and functional circuits provided with electric power, as the remote sensing location. | 08-13-2015 |